Curtis Cook's Loopy Lab

NumberUtilities.java

 
 public class NumberUtilities {
     
-    public static String getRange(int start) {
-        return null;
+    public static String getRange(int stop) {
+        StringBuilder range = new StringBuilder();
+        for(int i = 0; i < stop; i++) {
+            range.append(i);
+        }
+        return range.toString();
     }
     
     public static String getRange(int start, int stop) {
-        return null;
+        StringBuilder range = new StringBuilder();
+        for(int i = start; i < stop; i++) {
+            range.append(i);
+        }
+        return range.toString();
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        StringBuilder range = new StringBuilder();
+        for(int i = start; i < stop; i += step) {
+            range.append(i);
+        }
+        return range.toString();
     }
     
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder range = new StringBuilder();
+        for(int i = start; i < stop; i++) {
+            if(i % 2 == 0) {
+                range.append(i);
+            }
+        }
+        return range.toString();
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder range = new StringBuilder();
+        for(int i = start; i < stop; i++) {
+            if(i % 2 != 0) {
+                range.append(i);
+            }
+        }
+        return range.toString();
     }
 
 
     public static String getExponentiations(int start, int stop, int exponent) {
-        return null;
+        StringBuilder range = new StringBuilder();
+        for(int i = start; i <= stop; i++) {
+            range.append((int) Math.pow(i, exponent));
+        }
+        return range.toString();
     }
 }

TableUtilities.java

 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        StringBuilder table = new StringBuilder();
+        for(int i = 1; i <= 5; i++) {
+            for(int j = i; j <= (i * 5); j+=i) {
+                table.append(String.format("%3d |", j));
+            }
+            table.append("\n");
+        }
+        System.out.println(table.toString());
+        return table.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        StringBuilder table = new StringBuilder();
+        for(int i = 1; i <= 10; i++) {
+            for(int j = i; j <= (i * 10); j+=i) {
+                table.append(String.format("%3d |", j));
+            }
+            table.append("\n");
+        }
+        System.out.println(table.toString());
+        return table.toString();
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder table = new StringBuilder();
+        for(int i = 1; i <= tableSize; i++) {
+            for(int j = i; j <= (i * tableSize); j+=i) {
+                table.append(String.format("%3d |", j));
+            }
+            table.append("\n");
+        }
+        System.out.println(table.toString());
+        return table.toString();
     }
 }

TriangleUtilities.java

 public class TriangleUtilities {
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder stars = new StringBuilder();
+        for(int i = 0; i < numberOfStars; i++) {
+            stars.append("*");
+        }
+        return stars.toString();
     }
     
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder stars = new StringBuilder();
+       
+        int count = 1;
+        while(count <= numberOfRows) {
+            for(int i = 0; i < count; i++) {
+                stars.append("*");
+            }
+            stars.append("\n");
+            count++;
+        }
+        return stars.toString();
     }
 
 
     public static String getSmallTriangle() {
-        return null;
+        StringBuilder stars = new StringBuilder();
+        int count = 1;
+        while(count <= 4) {
+            for(int i = 0; i < count; i++) {
+                stars.append("*");
+            }
+            stars.append("\n");
+            count++;
+        }
+        return stars.toString();
     }
 
     public static String getLargeTriangle() {
-        return null;
+        StringBuilder stars = new StringBuilder();
+        int count = 1;
+        while(count <= 9) {
+            for(int i = 0; i < count; i++) {
+                stars.append("*");
+            }
+            stars.append("\n");
+            count++;
+        }
+        return stars.toString();
     }
 }